ALEKO premium 9 In, 80 Grit, 10 Holes Drywall Sander, sandpaper Discs (8-7/8" diameter) with Hook and Lock backing includes break-through innovations that improve performance, extend sanding life and increase productivity. Designed for fast material removal and long standing life. Hook and lock backing enables repeated attachment and removal of discs for a consistent secure connection. Optimal choice for use in most Drywall sanders; Ideal for all types of wood, metal and plastics.